LMTD for evaporators & condensers for a given terminal parameters & set of conditions for counter-flow is equal to that for parallel flow. In such heat exchangers, with one of the fluids condensing or evaporating, the surface area required is the least in the ______________ flow?
Correct answer: D. Same in either A , B. or C.
- A. Parallel
- B. Mixed
- C. Counter flow
- D. Same in either A , B. or C.
Explanation
When one fluid is condensing or evaporating, its temperature remains nearly constant, so the terminal temperature differences and LMTD do not depend on parallel or counter-flow arrangement. Consequently, the required area is the same for the listed arrangements.
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